在下列二次型中, 正惯性指数等于 2 的是 未知类型：{'options': ['[tex=13.786x1.571]CKlOGn/4oc+CIjd/NrEXYL4dkmrBlW2GCC51Nn4jxKAD1EpX2EG4iGqmx8WmWIijQ/1TBKOkYUR3PceE6jcAcuJWCFZNY7rgfvoZD8hjgnH6mnfX7xFxYsxbeC8J0MU/[/tex]', '[tex=20.0x1.5]CKlOGn/4oc+CIjd/NrEXYL4dkmrBlW2GCC51Nn4jxKDxI5EU0Rj+WwqAYMSi5YHMgh6qDu0Esm2hn0XdQHhgVu9qtIccLZ4PooZnR82N9TbDifHftkucc0Q6jUSD/QldaNHWkbnhOWTFIHc8kOCmgQ==[/tex]', '[tex=12.786x1.5]CKlOGn/4oc+CIjd/NrEXYL4dkmrBlW2GCC51Nn4jxKDxI5EU0Rj+WwqAYMSi5YHMrpG3Ol8X9Iuj7ckTZPEhiXRJE291fLQSXdrfPCxIyD0=[/tex]', '[tex=19.5x1.5]CKlOGn/4oc+CIjd/NrEXYL4dkmrBlW2GCC51Nn4jxKDxI5EU0Rj+WwqAYMSi5YHMrpG3Ol8X9Iuj7ckTZPEhiZT9IGbyWQcJ4g2U4WKVdSafU4LRqNlmItRnMTLxj2I+ESRedIlCVJELqkZllvLTdw==[/tex]'], 'type': 102}

在下列二次型中, 正惯性指数等于 2 的是 未知类型：{'options': ['[tex=13.786x1.571]CKlOGn/4oc+CIjd/NrEXYL4dkmrBlW2GCC51Nn4jxKAD1EpX2EG4iGqmx8WmWIijQ/1TBKOkYUR3PceE6jcAcuJWCFZNY7rgfvoZD8hjgnH6mnfX7xFxYsxbeC8J0MU/[/tex]', '[tex=20.0x1.5]CKlOGn/4oc+CIjd/NrEXYL4dkmrBlW2GCC51Nn4jxKDxI5EU0Rj+WwqAYMSi5YHMgh6qDu0Esm2hn0XdQHhgVu9qtIccLZ4PooZnR82N9TbDifHftkucc0Q6jUSD/QldaNHWkbnhOWTFIHc8kOCmgQ==[/tex]', '[tex=12.786x1.5]CKlOGn/4oc+CIjd/NrEXYL4dkmrBlW2GCC51Nn4jxKDxI5EU0Rj+WwqAYMSi5YHMrpG3Ol8X9Iuj7ckTZPEhiXRJE291fLQSXdrfPCxIyD0=[/tex]', '[tex=19.5x1.5]CKlOGn/4oc+CIjd/NrEXYL4dkmrBlW2GCC51Nn4jxKDxI5EU0Rj+WwqAYMSi5YHMrpG3Ol8X9Iuj7ckTZPEhiZT9IGbyWQcJ4g2U4WKVdSafU4LRqNlmItRnMTLxj2I+ESRedIlCVJELqkZllvLTdw==[/tex]'], 'type': 102}

设[tex=15.429x1.357]CKlOGn/4oc+CIjd/NrEXYPMrKY7YR6bQnYIT6RHXQTtkhSnIVg0YM+RT9EoYtnIRIBBCDLMZrxexPB7Q92nwqaNObvRfNr6fYoOxxOOB5KeWi8dul/72Aa7meWWDOofJ[/tex][tex=15.286x1.357]w1jiwhN28M7EUOfAKymDSvWjp6tLsrVLtIXWni4H/yqeUDeR7tgFdBDMMUqDi4C8Axoj5KcGYhKgXHI1eMxvFT2yqz8JU0J5G6ZVzZeoKkcA99jh3wF1mYUl6jKO+z7UhchjGZybAgTgnzm/cBb3yQ==[/tex]，且[tex=9.0x1.357]CKlOGn/4oc+CIjd/NrEXYPMrKY7YR6bQnYIT6RHXQTub7SnipdUJYMGMtGPDS5DqJ/Mr11NKCm+1NmpWlqOOpQ==[/tex]。证明，如果[tex=30.0x1.357]CKlOGn/4oc+CIjd/NrEXYPMrKY7YR6bQnYIT6RHXQTtZaVO0g6AJVDgZVz9tirIxrXANZ1N7F66XV5ymKSTY8VFNq8H9/9aRjFWO8CF4ueq3kBqAdofeE9+YnzZaPwQxFmJfebIORvJBMC47hDrAFP9fnVIxxOGh2MINi5k61+sLzQM7CsSPQ5syjoyb+o593oXxP00P0RPpEZNZeWR7wevjE8W+alPvRRHHNxhkXhA=[/tex]则[tex=15.357x1.357]vvUfMWB7qhXreignZ7ucHuuF3Eo9DkR508wp+cFQ3Ib//UZiNfe3Fdu2MSfHozk0YGaQO+5BMYnL+LBTAu3JTVzuInnPVyN/THdsdSGWGzc1odjTMsA5roIg5wjj/7oc[/tex]。

设[tex=15.429x1.357]CKlOGn/4oc+CIjd/NrEXYPMrKY7YR6bQnYIT6RHXQTtkhSnIVg0YM+RT9EoYtnIRIBBCDLMZrxexPB7Q92nwqaNObvRfNr6fYoOxxOOB5KeWi8dul/72Aa7meWWDOofJ[/tex][tex=15.286x1.357]w1jiwhN28M7EUOfAKymDSvWjp6tLsrVLtIXWni4H/yqeUDeR7tgFdBDMMUqDi4C8Axoj5KcGYhKgXHI1eMxvFT2yqz8JU0J5G6ZVzZeoKkcA99jh3wF1mYUl6jKO+z7UhchjGZybAgTgnzm/cBb3yQ==[/tex]，且[tex=9.0x1.357]CKlOGn/4oc+CIjd/NrEXYPMrKY7YR6bQnYIT6RHXQTub7SnipdUJYMGMtGPDS5DqJ/Mr11NKCm+1NmpWlqOOpQ==[/tex]。证明，如果[tex=30.0x1.357]CKlOGn/4oc+CIjd/NrEXYPMrKY7YR6bQnYIT6RHXQTtZaVO0g6AJVDgZVz9tirIxrXANZ1N7F66XV5ymKSTY8VFNq8H9/9aRjFWO8CF4ueq3kBqAdofeE9+YnzZaPwQxFmJfebIORvJBMC47hDrAFP9fnVIxxOGh2MINi5k61+sLzQM7CsSPQ5syjoyb+o593oXxP00P0RPpEZNZeWR7wevjE8W+alPvRRHHNxhkXhA=[/tex]则[tex=15.357x1.357]vvUfMWB7qhXreignZ7ucHuuF3Eo9DkR508wp+cFQ3Ib//UZiNfe3Fdu2MSfHozk0YGaQO+5BMYnL+LBTAu3JTVzuInnPVyN/THdsdSGWGzc1odjTMsA5roIg5wjj/7oc[/tex]。

按照最新的国家标准,达到寒潮标准的冷空气应至少在多长时间内达到怎样的降温幅度,并使得该地日最低气温下降到多少摄氏度________? A: 24h,大于等于8oC,4<br/>oC B: 24h,大于等于8oC,5<br/>oC C: 24h,大于等于10oC,4<br/>oC D: 24h,大于等于10oC,5<br/>oC

SN10-10型高压少油断路器其断流容量S oc)分,有Ⅰ、Ⅱ、Ⅲ型,Ⅰ型S oc=____,Ⅱ型S oc=____,Ⅲ型S oc=____。

求出 [tex=19.5x1.5]CKlOGn/4oc+CIjd/NrEXYL4dkmrBlW2GCC51Nn4jxKCsCQQs0kC5W8MRNDQYOdqMOUY3YzFfAg6pqV6HqP5U0FsSPwznyBbTjydSKtfDqzOXIM1u8ywh09b+D5whilglDFnGss2Mluv0EieYFSG/sQ==[/tex]的规范形.

如图,已知OC⊥OA,OC⊥OB,证明:直线OC⊥平面OAB.()证明:因为OC⊥OA,OC⊥OB,OA⊆平面OAB,OB⊆平面OAB,且[],()所以,直线OC⊥平面OAB.()上述证明过程中,括号[]中应填入的语句是()A.()OA、OB都在平面OAB内.()B.()OA∩OB=O()C.()OA⊥OB.()D.()OC⊥OA，OC⊥OB.

正常成人腋窝温度的范围是 A: 34~35 oC B: 36.0~37.4 oC C: 36.7~37.7 oC D: 36.9~37.9 oC E: 38.0~38.9oC

对流层中，气温随着高度的增加而降低，每升高100m平均气温下降（ ） A: 0.098 oC B: 1.89 oC C: 5.81 oC D: 0.65 oC